Connector straight with union nut 16×3/4 for PE-RT pipes SiGMA-Li

Connector straight with union nut 16×3/4 for PE-RT pipes SiGMA-Li is a mechanical fitting designed to join 16 mm PE-RT tubing to 3/4" threaded components. The fitting provides a straight, compact transition between plastic pipe and metal or threaded elements in plumbing and heating installations. Constructed for applications that require a reliable threaded union, this connector suits systems where PE-RT pipe must interface with valves, manifolds, or other threaded fixtures.

Advantages

This straight connector offers a secure mechanical connection between 16 mm PE-RT pipe and 3/4" threaded fittings without the need for heat or adhesives. Its union nut design enables straightforward assembly and disassembly for maintenance or replacement. Designed for compatibility with common domestic plumbing and underfloor heating installations, the fitting maintains a compact footprint and consistent flow path, reducing pressure loss at the transition point.

Suitable for

• Domestic plumbing connections where 16 mm PE-RT pipe meets 3/4" threaded valves or fittings
• Underfloor heating manifolds and branch connections using PE-RT tubing
• Hot water distribution circuits requiring a threaded union to metal components
• Service and maintenance points that need easy disconnection of PE-RT lines

Key specifications

• Pipe compatibility: PE-RT, 16 mm outside diameter
• Thread size: 3/4" standard threaded connection
• Connection type: straight mechanical connector with union nut
• Application temperature range: suitable for typical plumbing and underfloor heating service temperatures
• Flow orientation: inline straight-through design to minimize flow restriction

How to use

Prepare the PE-RT pipe by cutting a straight, square end and ensure the outer surface is clean and free of burrs. Slide the union nut and any compression or sealing components onto the pipe as required by the fitting design, then insert the pipe fully into the connector body until it seats. Tighten the union nut by hand and finish to the recommended tightening torque with a suitable wrench to create a leak-tight threaded union with the 3/4" fitting. Follow standard plumbing practices and verify alignment before final tightening.

Usage recommendations

Use compatible sealing elements and follow manufacturer's torque guidance where available. Confirm that the selected connector meets system pressure and temperature requirements, and perform a pressure test after installation. For repeated disassembly, inspect sealing surfaces and replace seals if wear or deformation is present.